Communication device
AssigneeBrother Kogyo Kabushiki Kaisha
InventorSusumu Chida
Life of this patent
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Abstract
When a facsimile device detects an audio signal via a CNG signal detection unit while detecting an OFF signal in a CNG signal during a telephone conversation, the facsimile device does not detect the audio signal as an OFF signal if the level of the detected audio signal is greater than a threshold and the frequency of the audio signal is within a predetermined audio frequency range. Accordingly, the facsimile device can reliably prevent a false detection of a noise that has a similar signal component to a CNG signal as a CNG signal. It is possible to prevent the facsimile machine from being automatically shifted to a facsimile receiving mode by the false detection of the noise.
Claims21
A communication device, comprising:
- a facsimile receiving portion that detects a facsimile activation signal that is transmitted from a remote device via an external communication line while a telephone conversation is being executed with the remote device, and that switches from telephone function into facsimile function to execute facsimile receiving operation;
- and
- an error preventing portion that prevents the facsimile receiving portion from erroneously executing the facsimile receiving operation based on noise;
- wherein the facsimile receiving portion includes:
- a facsimile activation signal detecting portion that detects the facsimile activation signal;
- a communicating portion that communicates with the remote device;
- and
- a receipt-controlling portion that enables the communicating portion into a state, in which the communicating portion is capable of receiving facsimile when the facsimile activation signal detecting portion detects the facsimile activation signal, and
- wherein the error preventing portion includes:
- a non-detection mode setting portion that sets the facsimile activation signal detecting portion in a non-detection mode, in which the facsimile activation signal detecting portion is disabled to detect the facsimile activation signal while telephone communication is being executed with the remote device;
- an instruction input portion that receives a user's instruction, while telephone communication is being executed with the remote device, the user's instruction being for bringing the facsimile activation signal detecting portion from the non-detection mode into a detection mode, in which the facsimile activation signal detecting portion is enabled to detect the facsimile activation signal;
- and
- a detection mode setting portion that sets the facsimile activation signal detecting portion into the detection mode upon receipt of the user's instruction.
A communication device, comprising:
- a facsimile receiving portion that detects a facsimile activation signal that is transmitted from a remote device via an external communication line while a telephone conversation is being executed with the remote device, and that switches from telephone function into facsimile function to execute facsimile receiving operation;
- and
- an error preventing portion that prevents the facsimile receiving portion from erroneously executing the facsimile receiving operation based on noise;
- wherein the facsimile receiving portion includes:
- a facsimile activation signal detecting portion that detects the facsimile activation signal;
- a communicating portion that communicates with the remote device;
- and
- a receipt-controlling portion that enables the communicating portion into a state, in which the communicating portion is capable of receiving facsimile when the facsimile activation signal detecting portion detects the facsimile activation signal, and
- wherein the error preventing portion includes:
- an instruction input portion that receives a user's instruction, while telephone communication is being executed with the remote device, the user's instruction being for bringing the facsimile activation signal detecting portion into a state, in which the facsimile activation signal detecting portion is capable of detecting the facsimile activation signal without being influenced by noise;
- and
- a noise-input preventing portion that prevents the user's voice from being inputted in response to input of the user's instruction.
Dependencies are inferred from the claim text.